CTC
Combustion Noise / Flue Resonance
Boiler is very noisy, with whistling or roaring sounds from the flue.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect gas/air ratio, Loose or poorly supported flue, Debris in burner or fan, Flue length or configuration outside CTC specification
How to Fix / Troubleshooting
Safety: Combustion adjustments must be performed by a qualified gas technician with appropriate instruments.
- Check flue installation: Ensure all flue joints are secure and that the flue is properly supported according to CTC instructions.
- Inspect terminal: Confirm the flue terminal is unobstructed and correctly oriented.
- Combustion check (technician): Use a flue gas analyser to verify CO₂/O₂ levels and adjust the gas valve or air settings as specified by CTC.
- Clean burner and fan (technician): Remove and clean the burner and fan assembly if contaminated with dust or debris.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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